Mechanical Design and Manufacturing Development of Injection Mold Screw Design Tools Based on Secondary Development of UG Shuangyuan Xiong Hegen Wang Huachang 2, Liu Litao 3 (1. School of Mechanical Automation, Wuhan University of Science and Technology, Wuhan 430081, China; 2. National Key of Material Forming and Mould Technology of Huazhong University of Science and Technology.
3 Solution realization and key technology 3.1 Establishment of screw model Due to the various standards and types of screws in the injection mold, the following description uses the hexagon socket screw in the PUNCH standard as an example. In the creation of the screw model, a parametric feature modeling technique is used to define geometric models with a set of expression parameters, and these expressions are mapped to the control dimensions of the screw model. In the screw design process, the model can be modified by simply driving the dimensional expression to get the required screw size.
The screw model controls the dimensions as shown.
Since the display part is not the same as the open part after the screw is generated, it is necessary to establish a screw body and a screw prosthesis when setting up the model, and set a reference set for it, wherein the screw body is set to TRUE (for display, such as Q) As shown, the screw prosthesis is set to FALSE (for cavity opening, as shown in (b).
3.2 The parameters of the screw model are configured to facilitate the screw design tool to read data and the user to query and add screw information. The tool stores the parameter information of the screw in an Excel spreadsheet. In the screw design, the program first automatically obtains the screw type and screw type configuration table in the screw configuration file, as shown in Table 1. Then, according to the screw type, all the information of the selected screw is obtained in the lower data table. The main parameters of the screw are shown in Table 2. And drive the model expression.
Table 1 Screw Type Configuration Table Data Path PUNCH Screw Standard Hexagon Screw - CCB Type Screw Large Diameter M Counterbore Hole Diameter (A Cup Head High Screw Length (D 3.3 Screw Connection Positioning and Generation For Screw Generation Operation, Not Only Select The required screw type and specifications also need to select the appropriate placement plane and positioning point according to different positioning methods. When the screw of a certain specification needs to be arranged in advance, the positioning point can be arranged by conceptual design. Just choose the location of the cloth.
The so-called conceptual design is to explore the design and planning of the unknown structure through product modeling, using a functional-functional surface-structure mapping model to express between the assembly parts and the parts, between the parts and the surface, between the surface and the surface. Coordination, joint, position, size constraints, and finally get the product's physical structure M. Conceptual design point tool is first on the arbitrary plane cloth parallel to the screw placement plane and the outer diameter of the selected screw and other arcs (convenient user Check if the generated screw is related to other entities, and assign an attribute to the arc, then project the center point of the arc onto the screw placement surface, and finally complete the positioning of the screw connection as shown.
Mechanical design and manufacturing After the bookmark6 user selects and positions the screw specifications, the screw design tool will automatically calculate the screw length according to the parameters selected by the user, and generate the required screws at the selected position, and then assign the screw related parameters to the screws. Entity for subsequent use. 3.4 After the screw and the open cavity screw of the connected part are generated, it is necessary to generate a corresponding screw cavity at the screw placement position. Before creating a screw cavity, you need to get all the entities that are involved with the screw body. Because there are too many entities in a set of injection molds, it will take a lot of time to traverse the entities that search for thousands of entities in all entities, and the tool will write the attributes of its thousands of entities to the properties when the screws are generated. Therefore, when the screw is opened with the connector, the tool can quickly search for the entity involved, which greatly reduces the opening time. In order to automatically associate the screw with the screw cavity and facilitate subsequent editing and deletion operations, the two are associated by geometric correlation techniques before the screw prosthesis and the connected body are subjected to a Boolean subtraction operation. The so-called Engineering technology extracts the geometric information of a part as the reference or control structure of other parts to achieve the purpose of linkage. China's manufacturing informationization, 2009, 380,000 Bin, Wang Huachang, Li Jianjun. Software development of injection mold screw design tool based on UG. Mold Industry, 2010, 36 (12:1-4. Zou Huijun, Zhang Qing. Several key issues in the conceptual design of computer-aided mechanical products. Journal of Shanghai Jiaotong University, 2005, 39 (7 Deng Ganwang, Yu Dejie. Knowledge-based Research on Computer Aided Product Conceptual Design Prototype. Mechanical Design and Manufacturing, 20030: 39-41. Li Chang, Li Jianjun, Wen Jianyong. UG-based related design technology and its application in progressive die CAD system. China Mechanical Engineering, 2002 , 13 (22: 1967-1970.
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